866488717 has 2 divisors, whose sum is σ = 866488718. Its totient is φ = 866488716.

The previous prime is 866488703. The next prime is 866488739. The reversal of 866488717 is 717884668.

It is a happy number.

866488717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 810028521 + 56460196 = 28461^2 + 7514^2 .

It is a cyclic number.

It is not a de Polignac number, because 866488717 - 2¹¹ = 866486669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866488517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433244358 + 433244359.

It is an arithmetic number, because the mean of its divisors is an integer number (433244359).

Almost surely, 2^866488717 is an apocalyptic number.

It is an amenable number.

866488717 is a deficient number, since it is larger than the sum of its proper divisors (1).

866488717 is an equidigital number, since it uses as much as digits as its factorization.

866488717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3612672, while the sum is 55.

The square root of 866488717 is about 29436.1804077907. The cubic root of 866488717 is about 953.3542434191.

The spelling of 866488717 in words is "eight hundred sixty-six million, four hundred eighty-eight thousand, seven hundred seventeen".